680456809 has 4 divisors (see below), whose sum is σ = 682171204. Its totient is φ = 678742416.

The previous prime is 680456797. The next prime is 680456839. The reversal of 680456809 is 908654086.

680456809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 460231209 + 220225600 = 21453^2 + 14840^2 .

It is a cyclic number.

It is not a de Polignac number, because 680456809 - 2²⁷ = 546239081 is a prime.

It is a super-3 number, since 3×680456809³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680456839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 856602 + ... + 857395.

It is an arithmetic number, because the mean of its divisors is an integer number (170542801).

Almost surely, 2^680456809 is an apocalyptic number.

It is an amenable number.

680456809 is a deficient number, since it is larger than the sum of its proper divisors (1714395).

680456809 is a wasteful number, since it uses less digits than its factorization.

680456809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1714394.

The product of its (nonzero) digits is 414720, while the sum is 46.

The square root of 680456809 is about 26085.5670630332. The cubic root of 680456809 is about 879.5628032332.

The spelling of 680456809 in words is "six hundred eighty million, four hundred fifty-six thousand, eight hundred nine".